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The specification of IEEE 802.22 defines the world-wide first cognitive radio (CR) standard. Within a range of 40 MHz to 910 MHz CR systems are allowed to allocate spectrum besides the currently established radio services like radio and TV broadcasting. In order to fulfill the regulative guidelines of interference limitations, a capable spectral sensing and(More)
Efficient use of radio spectrum is a necessity for future wireless systems. This can, for example, be accomplished by cognitive radios. An important point for designing future systems is to gain knowledge about the occupation of the frequency bands which may be used by the cognitive radio. This includes the general characterization of the traffic density at(More)
Regulation will experience enormous changes in the near future resulting in seamless connectivity by bluring spectrum borders. A promising approach in this context is dynamic spectrum allocation which leads to a more flexible access to spectral resources by employing intelligent radio devices called cognitive radios. This paper is concerned with(More)
Unter Verwendung der ‚Enzyme-Bridge‘-Immunoperoxidase (PAP)-Technik wurde das sogenannte schwangerschaftsspezifische β1-Glykoprotein (SP1) und einige placentaspezifische Gewebsproteine (PP5, PP10, PP11, PP12) im Gewebe von malignen Tumoren lokalisiert. Diese von Bohn aus menschlichen Placenten isolierten und charakterisierten fünf Glykoproteine wurden in(More)
The occurrence and location of proteins antigenically related to human pregnancy specific beta 1-glycoprotein (SP1) and to human placental tissue proteins (PP5, PP8, PP9, PP10, PP11, PP12) were studied in the afterbirth (placenta, membranes, decidua, and umbilical cord) of cynomolgus monkeys with use of an immunoglobulin enzyme bridge (PAP) technique. The(More)
We present the ǫ-outage capacity of incremental relaying at low signal-to-noise ratios (SNR) in a wireless cooperative network with slow Rayleigh fading channels. The relay performs decode-and-forward and repetition coding is employed in the network, which is optimal in the low SNR regime. We derive an expression on the optimal relay location that maximizes(More)
Mit Hilfe einer Immunglobulin-Enzym-Brücken-(PAP-) Technik wurde die Lokalisation von zwei neuen ubiquitären Gewebsproteinen (PP8, PP9) und von drei neuen plazentaspezifischen Gewebsproteinen (PP10, PP11, PP12) im Gewebe reifer menschlicher Plazenten untersucht: PP8 war hauptsächlich im Zytoplasma und in den Zellkernen der Trophoblastzellen (Chorion) und(More)
Using an enzyme-bridge immunoperoxidase (PAP) technique, it was revealed that pregnancy- and/or placenta-specific proteins, SP1, PP10 and PP12 were localized in human and cynomolgus monkey (Macaca fascicularis) polymorphonuclear neutrophils, and PP10, in mononuclear phagocytes. There was no difference in staining results, irrespective of whether the(More)
By using an immunoglobulin-enzyme bridge method, pregnancy-specific beta 1-glycoprotein (SP1) and placenta-specific tissue proteins (PP5, PP10, PP11, PP12) were investigated in 15 cases of mucinous cystadenocarcinoma and 20 cases of serous cystadenocarcinoma. These proteins could be detected in the cytoplasm of some malignant cells. In mucinous(More)
With use of an enzyme-bridge immunoperoxidase (PAP) technique, an immunohistochemical localization of the two new placenta-“specific” tissue proteins, PP5 and PP11, was investigated in 16 cases of breast cancer. PP5 was localized in the cytoplasm of breast cancer cells in 62.5% of cases examined and PP11, in 46.7%. Thus PP5 and PP11 may be markers for(More)